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(510 Model.)

G; P. SPEBR. Paper Drying Machine.

I No. 235 5s6; Patented Dec. 14,1880.

N. PETERS, PHDTD-LITHOGRAFHEFI, WASHINGTON. D c.

TATES GARRETT F. SPEER, OF PHILADELPHIA, PENNSYLVANIA.

PAPER-DRYING MACHINE.

SPECIFICATION forming part of Letters Patent No. 235,586, dated December 14, 1880.

Application filed November 16, 1880.

To all whom it may concern:

Be it known that I, GARRETT F. SPEER, of the city and county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements in Paper-Dryin g Machines; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

Figure 1 is a longitudinal section of my improved drying apparatus. Fig. 2 is a frontend view of the same. Fig. 3 is a perspective View of the mouth of the air-tube.

The same letter indicates the samepart wherever it occurs in the drawings.

My invention relates to the drying of paper to one side of which size has been applied; and it consists in the peculiar construction of an apparatus by which the sized paper from a continuous roll is made to pass through a long closed chamber, and to receive during its passage the impact of a strong current of cold air, so directed as to strike the surface of the paper at an acute angle with its surface, said current prodncin g,by its movement, a tendency to a vacuum beneath the moving sheet, and thus holding it closely upon its supportingrollers, all substantially in the manner hereinafter more specifically set forth.

In the accompanying drawings, which fully illustrate my invention, F marks a rotary fan of ordinary construction, operated by a belt from a pulley driven by any suitable power. From this fan an air-tube, T, extends downward and enters the front end of a long closed box, B, the mouth of the tube being enlarged and flattened, as shown in Fig.3, so that it will fit into a long slot, S, cut in the end of the box 13 to receive it.

The area of the mouth of the tube is equal to the area of its body, so that the air is under equal pressure throughout, and the area of the outlet of the box B is the same as that of the slot S, for the same purpose.

The paper to be sized and dried is in a continuous roll, hung in the frame A at R, its movement being controlled by a weighted brake, W, in the ordinary way. It passes from the roll R, over rollers r r, thence through a slot, V, in the bottom of the front end of the (No model.) 4

box B and over a series of rollers, r r, placed diagonally in the box, as shown, then out at .a slot in the top of the rear end of box B,

and thus produce such a tendency to a vacuum there as will cause the paper to press tightly upon the top of the rollers 1" over which it is passing, and thus prevent the fluttering and tearing of the paper.

The cover of box B is made removable, in sections, to allow of the inspection of any part .of the paper at pleasure.

The calenders D E may be used cold or hot, as preferred; but I have obtained the best results without the use of heat, the paper so produced being superior in strength and quality to that passed over steam-heated calenders, the tendency of the heat being to make the size brittle and impair the purity of its color.

I have found the use of cold air perfectly efficient in the rapid drying of the paper, as I am able, in an apparatus of this character, to dry from twenty to thirty feet a minute in a superior manner.

What I claim as my invention, and desire to secure by Letters Patent, is-- The paper-drying apparatus hereinbet'ore described, the same consisting of the combination of the cold-air fan F, tube T, with its enlarged mouth M, the closed box 13, provided with the slots S V, the rollers r r, diagonally placed, as shown, and the airoutlet 0, and mechanism for drawing the paper through the apparatus and winding it in a roll when finished, the whole constructed, arranged, and operating substantially in the manner specified.

In testimony that I claim the foregoing as my own invention I afix my signature in presence of two witnesses.

GARRETT F. SPEER.

Witnesses:

L. G. YOUNG, (inns. F. STANSBURY. 

